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Overmodulation control method and device

A control method and over-modulation technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as low control accuracy, and achieve the effect of improving efficiency and solving low control efficiency.

Active Publication Date: 2017-01-04
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide an overmodulation control method and device to at least solve the technical problem of low control accuracy when using the existing method for overmodulation control

Method used

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  • Overmodulation control method and device

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Experimental program
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Embodiment 1

[0029] According to an embodiment of the present invention, an embodiment of an overmodulation control method is provided, such as figure 1 As shown, the method includes:.

[0030] S102: Obtain a first reference voltage and a second reference voltage, where the values ​​of the first reference voltage and the second reference voltage are obtained by transforming the AC current in the control circuit;

[0031] S104: Calculate the vector angle and modulation ratio of the voltage vector to be modulated according to the first reference voltage and the second reference voltage;

[0032] S106: Determine whether the vector angle of the voltage vector to be modulated is within the over-modulation angle range corresponding to the modulation ratio, and when it is determined that the vector angle is outside the over-modulation angle range, compare the voltage vector to be modulated in the control circuit according to the modulation ratio. Modulation control is performed.

[0033] Optionally, in ...

Embodiment 2

[0083] According to an embodiment of the present invention, there is also provided an overmodulation control device for implementing the above-mentioned overmodulation control method, such as Image 6 As shown, the device includes:

[0084] 1) The obtaining unit 602 is configured to obtain a first reference voltage and a second reference voltage, wherein the values ​​of the first reference voltage and the second reference voltage are obtained by transforming the AC current in the control circuit;

[0085] 2) The calculation unit 604 is configured to calculate the vector angle and the modulation ratio of the voltage vector to be modulated according to the first reference voltage and the second reference voltage;

[0086] 3) The first determining unit 606 is configured to determine whether the vector angle of the voltage vector to be modulated is within the overmodulation angle range corresponding to the modulation ratio;

[0087] 4) The control unit 608 is configured to perform overmodu...

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Abstract

The invention discloses an overmodulation control method and device. The method includes the steps that a first reference voltage and a second reference voltage are obtained, wherein the value of the first reference voltage and the value of the second reference voltage are obtained according to AC transformation in a control circuit; a vector angle and a modulation ratio of a voltage vector to be modulated are calculated according to the first reference voltage and the second reference voltage; whether the vector angle of the voltage vector to be modulated is within an overmodulation angle range corresponding to the modulation ratio is judged, and when it is judged that the vector angle is out of the overmodulation angle range, overmodulation control is performed on the voltage vector to be modulated in the control circuit according to the modulation ratio. The overmodulation control method and device solve the technical problem that control accuracy is low when an existing mode is adopted to perform overmodulation control.

Description

Technical field [0001] The present invention relates to the field of electronic circuits, in particular to an overmodulation control method and device. Background technique [0002] At present, in the existing inverter circuit control process, the commonly used overmodulation method is Space Vector Pulse Modulation (SVPWM, Space Vector Pulse Width Modulation), that is, it is determined that the vector to be controlled is in each sector of the space vector In the over-modulation area, the over-modulation control of the vector is performed according to the modulation ratios corresponding to different over-modulation areas. However, the modulation ratios of the above-mentioned different over-modulation areas are only obtained based on the output voltage amplitude. Since the output voltage amplitude has no deviation within one period of over-modulation, this leads to the use of traditional over-modulation control methods, not only the calculation process It is complicated and the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 景铁龙武建飞胡晰怡
Owner GREE ELECTRIC APPLIANCES INC